package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {

    @Value("${reggie.path}")
    private String BasePath;

    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        log.info(file.toString());

        //获取文件原名
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //拼装文件名
        String uuid = UUID.randomUUID().toString();

        String realFileName = uuid + suffix;

        //创建一个目录对象
        File dir = new File(BasePath);
        if (!dir.exists()){
            //目录不存在，需要创建
            dir.mkdirs();
        }

        try {
            file.transferTo(new File(BasePath + realFileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(realFileName);
    }



    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        //输入流，通过输入流读取文件内容
        try {
            FileInputStream fileInputStream = new FileInputStream(new File(BasePath + name));
            //输出流，通过输出流将文件写回浏览器
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("image/jpeg");

            byte[] bytes = new byte[1024];
            int len = 0;
            while ( (len = fileInputStream.read(bytes)) != -1){
                   outputStream.write(bytes,0,len);
                   outputStream.flush();
            }

            outputStream.close();
            fileInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }


    }

}
